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The forward was diagnosed with a subluxation of his left shoulder. Pretty much, it's a temporary and partial dislocation of the shoulder. If it was a complete dislocation, Callahan would miss a lot more than two weeks.

If the time frame of the injury holds true, Callahan will only miss between four and seven games and would return to the ice on Valentines Day vs. the New York Islanders at the latest.

"He's a huge part of our team," Rangers forward Derek Stepan said. "But everyone is going to have to step up, take a little bit of his pie, and try to do some of the things he does. It's going to take six, seven, eight guys to fill the role that Cally does."

Callahan is a big part of the Rangers' game as he eats up ice time whether the team is skating 5-on-5, a man (or two) up or a man (or two) down.

He's an integral part of the team's special teams, as he's a regular killing penalties and has scored two of the three Rangers' power play goals.

He's also tied for second in the league with 27 hits, and ranks sixth among forwards with nine blocked shots.

With Callahan out, every one of his teammates will have to step their game up. The Rangers are lucky Callahan will only miss the two weeks, as losing a top-line guy that can do it all will set any team back.